Study on time-frequency characteristics of cellular transmenbrane potentials based on equivalent circuit model

Area of Science:

• Biophysics
• Electrical Engineering
• Cell Biology

Background:

• Pulsed electric fields (PEF) are used in various biological applications, including cancer therapy.
• Understanding the interaction between PEF and cell membranes is crucial for optimizing these treatments.
• Existing models may be computationally intensive or lack detailed membrane analysis.

Purpose of the Study:

• To introduce a novel equivalent circuit model for spherical biological cells under PEF.
• To analyze the frequency and time-domain responses of inner and outer cell membranes to PEF.
• To provide a computationally efficient method for explaining PEF-induced bioelectric effects.

Main Methods:

• Development of an equivalent circuit model based on a multilayer dielectric model.
• Complex-domain analysis to derive transfer functions for inner and outer membranes.
• Introduction of time-domain solutions for transmembrane potentials induced by PEF.
• Frequency-domain analysis to characterize membrane responses.

Main Results:

• The model accurately represents the behavior of cell membranes under PEF.
• Different PEF durations exhibit selective effects on inner and outer membranes.
• Inner membranes show band-pass filter characteristics, while outer membranes exhibit low-pass filter characteristics.
• The model successfully explains bioelectric effects like electroporation and intracellular electromanipulation.

Conclusions:

• The proposed equivalent circuit model is a valuable, computationally undemanding tool for studying PEF-cell interactions.
• This model complements existing numerical and analytical methods.
• It offers a preliminary explanation for key bioelectric effects relevant to PEF applications in tumor treatment.